Aib-blast plastering-machine



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G. E. WHITE.

AIR BLAST PLASTERING MACHINE.

APPLICATION FILED APR-15.1918.

Patented June 3, 1919.

3 SHEETSSHEET I.

G. E. WHITE.

AIR BLAST PLASTERING MACHINE.

APPLICATION FILED APR. 15. I9I8.

. Patented June 3, 1919.

n 3 SHEETS-SHEET 2; @5 J J 52y G. E. WHITE.

AIR BLAST PLASTERJNG MACHINE.

APPLICATION FILED APR-15,1918.

M 52AM;

3 SHEETS-SHEET 3.

Patented June 3, 1919.

LSQ595TI L iii V GILBERT E. WHITE, OF KEWANEE; ILLINOIS.

AIR-BLAST PLASTERING-MACHINE..

Specification of Letters Patent.

Application filed April 15, 1918. Serial No. 228,593.

To all whom it may concern:

Be it known that I, GILBERT E. WHITE, citizen of the United States of America, and resident of Kewanee, Henry county, Illinois, have invented a new and useful Air-Blast Plastering-Machine, of which the following is a specification.

The object of this invention is to provide means for forcibly and intermittently applying measured quantities or charges of plastic material, such as plaster or cement, to a surface to be coated through intermittent use of air blasts.

A further object of this invention is to provide means for intermittently applying measured quantities or charges of plastic material such as plaster or cement, to a sur: face to be coated with force through intermittent use of air blasts, reactions of yielding pressure devices operating to determine and alternate the operations of successive air blasts.

A further object of this invention is to provide means for forcibly and intermittently applying measured quantities or charges of plastic material such as plaster or cement, to a surface to be coated, through intermittent use of air blasts, reactions of yielding pressure devices operating to determine and alternate the operations of successive air.

blasts, the alternate operation of air valves and reaction of yielding pressure devices being dependent upon difl'erentlal pressure areas of said air valves in respect to a piston acting against said yielding pressure devices.

My invention consists in the construction, arrangement and combination of elements hereinafter set forth, pointed out in my claims and illustrated by the accompanying drawing, in which- Figure 1 is an elevation, partly. in section,

of the complete apparatus. Fig. 2 is a sectional elevation of a portion of the apparatus at right angles to Fig. 1. Fig. 3 is a bottom plan of the apparatus, portions being broken away to economize space. Fig. 4 1s a crosssection on the indicated line 4t of Fig. 2, portions being broken away to economize space. Fig. 5 is a cross-section n the inclicated line 5 of Fig. 2, portions being broken away to economize space.

In the construction of the apparatus as shown the numeral designates a suitable receptacle or tank, generally cylindrical in form and vertically disposed. A niche or pocket 11 is formed in the wall of the receptacle 10 and extends from a point adjacent the upper end of said receptacle to a point near the lower end thereof, where said niche is formed with a bottom 12 which is formed with an opening 13. A feeding member 1t, preferably formed as a metal disk, is mounted on the bottom 15 of the receptacle 10 and pivoted at its center thereto, preferably by means of a stud 16 having a conical upper end portion or head 17 within the receptacle and secured by a key 18 beneath said bottom. The feeding member 14 extends and is adapted for rotary travel between the bot-- tom 12 of the niche and the bottom 15 of the receptacle. A tubular standard 19 is mounted in the niche 11 and is formed with a base adapted to be secured to the bottom 12 of said niche, the bore of said standard preferably tapering upwardly and communieating at its lower end with'the hole 13 in said bottom 12. The standard 19 extends approximately one-half the height of the niche 11 and at its upper end is formed with a globular valvecasing 20 having a valve seat 21 at its lower end adapted to receive a ball valve 22 and close the passage through saidsta'ndard at times. A hollow, laterally extending boss 23 is formed on the standard 19 immediately below the valve casing 20 and said boss is closed at its outer end by a screw cap A. rock shaft 25 is journaled horizontally in and extends across and projects at both ends from the boss 23 and an elbow 26 is mounted on and secured by a set screw 27 to said rock shaft within said boss and standard. The free end of the elbow 26 engages the lowermost point of the ball valve 22, thus adapting said elbow to raise said valve at times. A blast chamber 28 is provided and is formed with a tubular arm 29 tapped into the upper end of the standard 19 above the valve casing 20, and said blast chamber also is provided with a vertically disposed cylinder 30 approximately parallel with and spaced from the arm 2-9. A pet cock or relief valve 31 is tapped into the upper portion of the blast chamber 28 and has the function of relieving, when opened manually, any air-lock which may occur in the operation of the apparatus. A globular valve casing 32 is formed at the initial end of the blast chamber. 28 and a ball valve 33 loosely mounted in said casing cooperates with a seat 34 to close entrance to the blast chamber at times. A cut-off valve casing 35 is tapped on the upper end of the valve casing 82 and carries a cut-off valve 36, shown conventionally, adapted for manual actuation to control entrance to the valve casing 32. A supply pipe 37 is tapped into the cutoff valve casing 35 and serves to supply the operating medium such as compressed air from a tank or pump (not shown) to the blast chamber. The lower end portion of the cylinder 30 normally is closed by a cap 88 screwed thereon and locked against accidental removal by a set screw 39. A piston rod a0 is mounted for reciprocation in the cylinder 30 and blast chamber '28, having slide bearings in the center of the cap 38 and in a brace 11 formed in the blast chamber. The upper end portion of the piston rod 4C0 is adapted loosely to engage at, times with and raise the ball valve 33 from the seat 3%. A piston head 4'2 is fixed to the rod -10 and is adapted to reciprocate within the cylinder 30. A Washer 43 is mounted loosely on the piston rod l0 and rests on the cap 38. An expansive coil spring ll is mounted within the cylinder 30 and impinges at opposite ends on the piston head 12 and washer 13, said spring having the function of returning the piston head to its uppermost position in the cylinder.' An arm l5 is fixed to one outer end portion of the rock shaft 25 and normally is inclined upwardly and outwardly. A pitman l6 is pivoted at its forked upper end to the outer end portion of the arm l5 and ext-ends loosely through a hole in the outermost portion of the bottom 12 of the niche 11, whereby stability is given to said pitman in reciprocatory operation hereinafter described. The pitman 4e6-is formed with a longitudinal slot l7 and is externally threaded throughout the length of said slot and compassing the lower terminal of the pitman. A lever 48 is mounted loosely through the slot -17 of the pitman A6 and is pivoted at one end to a forked lower end portion of the piston rod l0, the opposite end portion of said lever extending loosely through a hub 49 (Fig. 5), which hub is pivoted, as by a concealed bolt 50, to a boss 51 formed or mounted on oneside of the standard 19 just above the base of said standard. Spaced nuts 52, 53 are screwed on the pitman 16 on opposite sides of the lever 48 and are secured by jam nuts 51. The spacing of the nuts 52, 53 provides for a range of movement of the lever 48 between alternate engagements of said lever with said nuts during further travel of the lever which ultimately effects a reciprocatory movement of the pitman 4:6 and consequent rocking movement of the shaft 25, oscillation of the elbow 26 and unseating or seating of the ball valve The feeding disk 1% operates between the bottom 12 of the niche 11 and the bottom 15 of the receptacle and consequently operates between the bore of the standard, the hole 13 and an elbow 55 formed on or fixed to the bottom 15 and communicating with a discharge pipe or hose 56. Pockets 57, preferably holes of greater diameter at their lower than at their upper ends and arranged in an annular row concentric with the axis of the stud 16, are formed in the marginal portion of the disk ll and are adapted to register successively with the hole 13 and initial end of the elbow It is the function of the pockets 5'7 to carry plastic material from the receptacle 10 and hold it, in partition-like manner, across the passage from said hole to said elbow; and when such condition exists and the valve 22 is opened, a blast of air passes through the standard 19 and discharges said plastic material from said pocket 57 in reg ister as described, through the elbow 55 and discharge pipe 56. To effect such result it is necessary to provide means for intermittently rotating the disk ll successively to present pockets 57 in register with the hole 13 and elbow 55 and such means should be synchronized with the mechanism above described for controlling the valves and The operating means for the disk 14 consists preferably of a bell-crank lever 58 suitably fulcrumed on a bracket 59 and provided at the upper end of its vertical arm with a spring-pressed dog 0 adapted to engage and cooperate successively with ratchet teeth 61 formed in the lower side of said disk; said dog being arranged to operate through a slot (32 (Fig. 3) in the bottom 15 of the receptacle. The bell-crank lever 58 is operated and the movement thereof synchronized with the valve operating means by a connecting rod ()3 forked at both ends and piv oted at said ends respectively to the lever l8 and the outer end of the recumbent arm of said bell-crank lever.

In practical use of the apparatus as described the plaster or cementitious material, or any other suitable material desired to be used with the device, is mixed directly in or received after mixing by the receptacle 10 and owing to the weight thereof said material is supported directly on the disk 11 and fills the exposed pockets 5 of said disk. After loading the receptacle 1 0 with the desired quantity of material. the valve 36 is opened manually; it being presumed that the supply pipe 37 is in communication with the source of compressed operating medium such as air in suflicient quantity and at re- 7 moss-7e head 42 moves the same downwardly against the tension of the spring 44, thus moving the piston rod 40 downwardly and permitting the valve 33 to seat and cut off tempoply.

rarily admission of pressure from the pipe 37. The downward movement of the rod 40 effects a movement of the lever 48 through an are which performs two operations; namely, oscillation of the bell-crank lever 58 through the rod 63 and consequent one-step movement of the feeding disk 14 .to the end of advancing one loaded pocket 57 into register with the hole 13 and elbow 55; and the other operation of opening the entrance to the standard 19 by movement of the elbow 26 through an arc'to raise the ball valve 22, such movement being effected by engagement of the lever 48 with the nut 53 and consequent downward movement of the pitman 46. It will be noted that the range of movement provided for the lever 48 between the nuts 52. 53 permits feeding movement of the disk 14 anterior to the opening movement of the valve lVhen the two operations resulting from the downward movement of the piston rod 40 have been completed, the pressure trapped in the blast chamber 28 and arm 29 is exerted through the standard 19 and hole 13 to drive the charge of plastic material contained in the registering pocket 57' through the elbow and discharge pipe 56 to the end of depositing said charge with force as a separate entity on a surface to be coated. By this means the pressure in the blast chamber is permitted to equalize with external air pressure and the way is prepared for reaction of the piston head 42 under pressure of the spring 44 to its normal position, which has the effect of returning the piston rod 40 upwardly. The upward movement of the piston rod 40 has three functions; namely, returning the bell-crank 58 in preparation for the next step movement of the feeding disk,

permitting the valve 22 to close, and opening the valve 33 for recharging of the blast chamber 28 from the source of pressure supparts of the apparatus is repeated to the conclusion of the work in hand, the exhaustion of the supply of plaster, or manual closing of the valve 36; all of said movements being automatic except the operation of the latter valve. It sometimes occurs that the parts oecome locked by incomplete reaction and the valves 22 and 33 are simultaneously closed or the spring 44 remains compressed, in which event the valve 31 is manuallv opened to release air pressure in the chamber 28.

The disk 14 may be used interchangeably with other disks of similar size and character having differently sized or differently spaced openings 57, whereby the quantity of plaster contained in each charge or the spac- Then the operation of the movable ing of charges may be modified for varying conditions ,of work.

Primarily this apparatus is designed for use in the operation commonly known as pebble-dashing where the plaster is applied in successive'chargesto a surface to be coated and is not troweled, brush-treated or otherwise operated upon after its application. i

It has been found that where the plastic material is applied to a surface with considerable force, as provided by my apparatus, the coating formed is harder, more waterproof, denser and less liable to crack or deteriorate due to the action of the elements; and that as successive coats areapplied the successive pounding due to the air blasts produces a hard surface which is water proof and will last much longer than when applied or produced in the ordinar manner. The process is also much more rapid than when performed manually.

Tension of the spring 44 maybe adjusted ,by screwing the cap 38 in either direction to adapt the spring pressure to the release of air at different pressures as required to deliver the plastic material at different altitudes or through different lengths of dis charge pipe.

I claim as my invention 1. A machine for automatically delivering successive charges of previously mixed plastic material, comprising a pipe, a receptacle for the plastic material, means for introducing successive charges of said material into said pipe, and automatic means for intermittently directing a blast of fluid pressure through said pipe to discharge said plastic material.

2. An air-blast plastering machine, comprising a receptacle, adischarge passage, means for feeding plastic material from the receptacle into the passage, and means synchronized with said feeding means for intermittently directing a blast of fluid pressure through said passage after each operation of said feeding means.

'3. An airblast plastering machine, comprising a receptacle, a discharge passage, means for intermittently feeding a quantity of plastic material from the receptacle into said passage, and means for automatically and intermittently directing a. blast of fluid pressure through said passage after each operation of said feeding means.

4. An air-blast plastering machine, comprising a receptacle, a discharge passage, means for feeding a quantity of plastic material from said receptacle and holding it in a partition-like manner across said passage, and means for intermittently directing a blast of fluid pressure through said passage to force the material therefrom.

5. Anair-blast plastering machine. comprising a receptacle, a discharge passage,

means for feeding a quantity of plastic material from said receptacle and holding it in a partition-like manner across said passage, and means for then automatically directing an intermittent blast of fluid pressure through said passage to force the plastic material therefrom.

6. An air-blast plastering machine, comprising a receptacle, a discharge passage, a traveling feeding member having a pocket for carrying mixed plastic material from said receptacle and holding it in a partitionlike manner across said passage, and means for directing an intermittent blast of fluid pressure through said passage and the pocket to force the plastic material therefrom.

7. An air-blast plastering machine, comprising a receptacle, a discharge passage member, a feeding member having a plurality of pockets for carrying plastic mate-. rial from said receptacle and holding it in a partition-like manner across said passage, means for intermittently advancing said feeding member, and means for automatirally directing an intermittent blast of fluid pressure through the passage member after each operation of said feeding member.

8. An air-blast plastering machine, comprising a receptacle, a discharge passage, a feeding member having a pocket for carrying plastic material from said receptacle and holding it in said passage, and means for directing an intermittent blast of fluid pressure through said passage and said pocket.

9. An air-blast plastering machine, comprising a passage, a rotary feeding member mounted on an axis substantially parallel to said passage, said member operating partly across and partly on the exterior of said passage and having openings for successive registration with the latter, said openings being filled with plastic material before they enter the passage, and means for then directing an intermittent blast of fluid pressure through the passage and the openings registering therewith.

10. An air-blast plastering machine, comprising a receptacle, a discharge passage, a rotary disk mounted on an axis substantially parallel to said passage and movable partly across the latter and partly in said receptacle, said disk having an annular series of openings concentric with its axis and adapted for successive registration with said passage and also adapted to carry plastic material from the receptacle and hold it in a partition-like manner across said passage, ratchet and dog devices for intermittently turning said disk successively to register the openings thereof with said passage, and means for directing an intermittent blast of fluid pressure through said passage after each turn of said disk.

11. An air-blast plastering machine, comprising a passage having a pressure inlet, a valve for said inlet, a second valve between the delivery end of the passage and said first valve, a blast chamber communicating with said passage between the two valves, means having a pressure-operated prime mover in said chamber for controlling said valves to cause the same to alternately open and close, one valve standing open when the other is closed, means for feeding plastic material into the passage between its delivery end and said second valve, and means operable from said prime mover for actuating said feeding means.

12. An air-blast plastering machine, comprising a passage having a pressure inlet, a valve for said inlet, a second valve between the delivery end of the passage and said first valve, a blast chamber communicating with said passage between the two valves, a pressure-operated prime mover in said chamber, a rod both rising and depending from said prime mover, the upper end of said rod operating said first named valve, a horizontal lever fulcrumed independently of said stem and connected with the lower end of the same for movement thereby, means for feeding plastic material into the passage between the delivery end thereof and said second valve, operating connections between said lever and said second valve, and other operating connections between said lever and said feeding means.

. 13. An air-blast plastering machine, comprising a passage having a pressure inlet, a valve for said inlet, a second valve between the delivery end of the passage and said first valve, a blast chamber communicating with said passage between the two valves, a prime mover mounted in said blast chamber and operable in one direction by the pressure therein, operating connections between the two valves and said prime mover, a rotatably mounted disk having openings for conducting plastic material into and holding it in partition-like manner across the aforesaid passage below the second valve, a ratchet and a dog for turning said disk 1ntermittently, and means operable from the prime mover for actuating said do 1 1. An air-blast plastering machine, comprising a vertical tank having its side bulged inwardly to form a vertically extending external niche across the lower end of which the bottom of the tank extends, a vertical passage member secured in said niche and having an outwardly directed upper end provided with a fluid pressure inlet, the lower end of said passage member communicating with an opening in the bottom of the tank, valve means-in said passage for permitting the discharge of successive blasts of fluid pressure from the lower end thereof, a feeding disk operating over said bottom of the tank and extending partly across the lower end of said passage member, the disk having openings adapted to carry plastic material and hold it in partition-like manner across the lower end of said passage member, a discharge passage below said disk and in line with said passage member, and means for intermittently turning said disk.

15. An air-blast plastering machine, comprising a passage member having a fluid pressure inlet, means for automatically causing the passage of successive blasts of fluid pressure therethrough, and means for feeding a predetermined quantity of plastic material to said passage member before each blast.

16. An air-blast plastering machine, comprising a passage having a pressure inlet, a valve for said inlet, a second valve between the delivery end of the passage and said first valve, a blast chamber communicating with said passage between the two valves, means having a pressure-operated prime mover in said chamber for controlling said valves to cause the same to alternately open and close,

one "alve standing open when the other is closed, a relief valve in said chamber between the other two valves, means for feeding plastic material into the passage between its delivery end and said second valve, and

means operable from said prime mover for actuating said feeding means.

17. An air-blast plastering machine, comprising a passage having a pressure inlet, a valve for said inlet, a second valve between the delivery end of the passage and said first valve, a blast chamber communicating with said passage between the two valves, a piston head mounted for reciprocation in said blast chamber and spring-pressed in one direction, means connected with said piston head for opening the first valve when spring actuated and admitting a blast of fluid pressure, thereby actuating said piston head in the opposite direction, a feeding member having a plurality of pockets for carrying plastic material and holding it in partitionlike manner across said passage, means connected with said piston head for openin the second valve when moved by fluid pressure, thereby admitting such fluid pressure to the pressure inlet and discharging the material from the pocket of the feeding member in registration therewith, and means connected with said piston head for producing step-bystep movement of said feeding member,

Signed at Des Moines, in the county of Polk and State of Iowa, this 3d day of April, 1918.,

G. E. WHITE. 

